Cable Modem Router combo default passwords

I recently had difficulties connecting to a cable modem / router combination and since it took me a while to find its default username and password, I decided to share it here.

Rogers-SMCYou may find yourself in this situation if you are short term using somebody else’s Internet and, for some reason, they cannot provide tech support. For example, you may be renting an apartment via AirBnB or a similar service and the Internet connection is not working as described.

In my particular situation, I was dealing with a seemingly Rogers Cable Internet business connection, so I expected a cable modem similar to the Motorola Surfboard 6121 I had purchased and provisioned a while back. These are the modems used by these ISP, courtesy of dslr-rgrs:

DOCSIS 3.0 Modems
. SMC D3GN (Modem / router combo) - Info Link, Feature Sheet, manual, Scribd,
We heard that there were SUPPOSED to be modem only offerings coming, but they never happened.
DOCSIS 2.0 Modems
. Toshiba PCX2600 - Info Link
. Scientific Atlanta Webstar – Info Link, manual, Sheet
. Motorola SurfBoard (the latest addition to Rogers DOCSIS modem family) - Info Link (Not necessarily supported)
Docsis (1.0, 1.1) for HiSpeed and HiSpeed Lite ... Many no longer supported.
. Ericsson Piperider - Aastra Piperider* - Info Link
. Terayon Terajet TJ615/715 - Info Link
. RCA DCM 235 - Info Link
. Toshiba PCX2500 - Info Link
. Scientific Atlanta Webstar - Info Link
. Motorola SurfBoard (the latest addition to Rogers DOCSIS modem family) - Info Link
* Ericsson recently sold their cable modem business to Aastra
The following Non Docsis modems have been phased out (for HiSpeed and HiSpeed Lite) ...
. Terayon TeraPro TCM 100 (archaic - rarely seen for new installs)
. Terayon TeraPro TCM 200 - Info Link
. Motorola CYBER SURFR Wave (normally only seen in ex-Shaw areas)
. Lancity Modem (archaic - rarely seen for new installs)

Luckily, I was quite sure this was a DOCSIS 3 modem, so it was very likely the SMC DG3N. I also knew that Rogers, the ISP, provisions all these modems with the same username / password combination. This cable modem used to suffer (back in 2009) from a pretty serious provisioning issue, namely anyone could login from the Internet at https://[IP address]:8080 with mso/cxf1rst! but after it was widely circulated, Rogers seems to have closed this loophole. Just like the Motorola Surfboard 6121, the configuration page was to be found at

In the end, the winning login/password combination was rogcesadmin / nas00Rn7TU (it seems that this is the new password as of December 8, 2011) but there are many others, as listed by various users in the pages listed in sources:

  • admin / admin, Admin, smcadmin, default
  • cusadmin / password –
  • rogcesadmin / wra8uje
  • mso / msopassword
  • administrator / [blank] – SMC3100
  • cusadmin / highspeed ( – mostly Comcast, 8013WGN
  • admin / barricade (BR7401)

I neither of the above works, consider resetting the modem to factory defaults by holding the reset button on the back of the SMCD3GN for 30s. Needless to say, this unit is a good cable modem, but it is quite useless as a wireless router – use a separate unit for better performance, after disabling it first on the cable modem (“Disable All Commercial Gateway Functions”) – see jc-wireless below.

The pages listed below should answer any further question; however, if you still cannot find the answer you are looking for, feel free to ask in comments.

Sources / More info: dslr-rgrs, SMC-3100, def-pssw, dh-sec, jc-wireless, twtr-frustration


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